Claims
- 1. A process for preparing an oxygen-scavenging thermoplastic resin composition, which process comprises the steps ofcalcining in a furnace or kiln a non-electrolytic acidifying component so that it is dehydrated, preparing a resin mixture comprising an oxidizable metal component, an electrolyte component, the calcined non-electrolytic acidifying component and a thermoplastic resin and melt compounding the resin mixture, wherein the oxidizable metal component is selected from the group consisting of iron, zinc, copper, aluminum, tin and compounds thereof, with the proviso that copper acetate is excluded, and wherein the non-electrolytic acidifying component is selected from the group consisting of monocalcium phosphate, sodium acid pyrophosphate, sodium metaphosphate, sodium trimetaphosphate, sodium phosphate monobasic, sodium hexametaphosphate, potassium phosphate monobasic, potassium acid pyrophosphate and combinations thereof.
- 2. A process according to claim 1 wherein the non-electrolytic acidifying component is sodium acid pyrophosphate, monocalcium phosphate or combinations thereof.
- 3. A process according to claim 1 wherein about 10 to about 200 parts by weight electrolyte component and non-electrolytic acidifying component are added per 100 parts by weight oxidizable metal.
- 4. A process according to claim 1 in which not more than 500 ppm of water is present in the resin mixture prior to melt compounding.
- 5. A process according to claim 1 in which not more than 200 ppm of water is present in the resin mixture prior to melt compounding.
Parent Case Info
This is a continuation-in-part of copending application Ser. No. 08/483,302 filed Jun. 7, 1995, now U.S. Pat. No. 5,744,056 which is a continuation-in-part of application Ser. No. 08/249,758 filed May 25, 1994, now abandoned, which is a divisional of application Ser. No. 08/092,722 filed Jul. 16, 1993, now abandoned.
US Referenced Citations (19)
Foreign Referenced Citations (8)
Number |
Date |
Country |
2178111 |
May 1996 |
CA |
2742874 |
Apr 1979 |
DE |
2129844 |
Nov 1972 |
FR |
1556853 |
Nov 1979 |
GB |
60-158257 |
Aug 1985 |
JP |
A01176419 |
Dec 1987 |
JP |
A04090847 |
Mar 1997 |
JP |
A04090848 |
Mar 1997 |
JP |
Non-Patent Literature Citations (2)
Entry |
Active Packaging Films And Susceptors, UNCTAD/GATT, Geneva XP 000574239. |
Packaging Progress Report on NDC/PEN and Oxygen Scavenger Concentrates (Part**; Oxygen Scavenger Concentrates) by Boh C. Tsai, Jun. 19, 1997. |
Continuation in Parts (2)
|
Number |
Date |
Country |
Parent |
08/483302 |
Jun 1995 |
US |
Child |
09/044043 |
|
US |
Parent |
08/249758 |
May 1994 |
US |
Child |
08/483302 |
|
US |